Give two RemoveStaleEntries functions unique names

chrome/browser/previews have two distinct (but similar)
RemoveStaleEntries functions and in some extreme jumbo builds
they compile in the same translation unit and clash.

This CL renames them RemoveStaleBlacklistEntries and
RemoveStaleOfflinePageEntries.

Bug: 914577
Change-Id: I69a837393d0586194bcd85f66eadfe85522418e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1584261
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Auto-Submit: Daniel Bratell <bratell@opera.com>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654453}
2 files changed